Holy Smokes the Jacob's Ladder that was recently seen on The Biggest Loser is most definitely one hard core workout. My gym recently brought this machine in and I had been dying to get a chance to work out on it. Gym buddy and I gave it a try tonight. Basically you strap yourself in onto a self powered ladder that is designed to place the user at a 40° angle in order to take stress off of the lower back. Because Jacobs Ladder is self-paced, the faster you go, the faster it goes, and in order to stop, just slow down. It feels like you are going at a full speed pace run when you get your heart rate going. I will most likely do this over and over each day in order to get a good amount of endurance going with it. I have to admit we alternated one minute intervals for only 5 minutes! We felt like we had done a full 30 minute cadio workout.